As the protestors moved peacefully down the 16th Street Mall, under police escort, one of the protestors could be seen carrying a sign that read "The only good cop is a dead cop."

The protest was organized on Facebook and the reasoning behind the protest was described on the Facebook page:

Join us for an emergency mobilization to show support and solidarity for the rebels in the streets of Baltimore and Ayotzinapa, Mexico as they take on the violence of the state and its defenders.

Across North America, communities are rising up against State terror and those who enforce this terror and protect those in power.

In Baltimore, 25 year old Freddie Gray was killed after suffering major injuries to his throat and spine in a violent interaction with police. The people of Baltimore have risen up to demand justice and an end to the killing of their youth.

In Ayotzinapa, Mexico, 43 student-teachers were disappeared by the state after they planned a protest. Local communities across Mexico, but particulary near Ayotzinapa have been engaged in insurrection for months, as they challenge the state and demand justice.

Protestors were asked to "bring your banners, signs, anger and hope."

Denver Police said there were two felony arrests -- for assault to police, and robbery. Misdemeanor arrests ranged from resisting police, disobedience to lawful orders, obstructing roadways and interference.